There is no intrinsic relationship between frequency and intensity. Frequency depends entirely on the situation and the spectrum of radiation. For example, a tuning fork designed to vibrate at 1000 Hz will emit virtually no other sound at different frequencies. A VLF antenna designed for 1000 Hz will emit little outside a narrow band of EM frequencies centered on 1000 Hz. Blackbody radiation may be distributed over a very broad or relatively narrow spectrum depending on the temperature of the emitting object

First, are you thinking of acoustic waves, EM waves or something else? Perhaps you're thinking of energy of photons rather than intensity? What's the physical situation?